Enter the plastering work
Calculate a rectangular room's walls or enter a measured plaster area directly.
Editable assumptions: 12 mm thickness, 1:4 mortar, 1.33 dry-volume factor and the displayed material densities are planning inputs, not universal specifications. Actual plaster thickness, mix, sand grading, substrate condition and project specification can change consumption.
Waiting for calculation
—
Your plastering material estimate will appear here after you click the button.
—net plaster area
—wet plaster volume
—cement requirement
—sand requirement
Finelib Prices
Check cement & sand prices
Carry the calculated plastering quantities into supported current material price intelligence.
Check current material prices →Finelib Match
Find plasterers / suppliers
Use the calculated area and quantities to request suitable businesses and Offers.
Find businesses / Get Offers →Planning estimate: Uneven blockwork, dubbing-out, corners, reveals, columns, beams, surface roughness and workmanship can increase mortar use. This calculator estimates the plaster coat itself and does not automatically include separate rendering coats, bonding agents, mesh, additives, scaffolding or labour.
How the estimate works
Net plaster area is multiplied by plaster thickness to obtain wet mortar volume. The editable dry-volume factor converts this to an estimated dry ingredient volume. The cement:sand ratio divides that volume into cement and sand fractions. Cement volume is converted to mass using the entered bulk density and then to whole bags. Sand is shown in cubic metres and as an approximate bulk weight. Wastage is applied to the material quantities.